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Allowance for Losses on Loans - Activity in Allowance for Loan Losses by Loan Portfolio Segment and Class (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | $ 166,955 | $ 149,284
Charge-offs | (152) | (618)
Recoveries | 1,886 | 3,197
Provision & Transfers | 1,500 | (4,350)
Ending Allowance | 170,189 | 147,513
Commercial loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 109,923 | 89,335
Charge-offs | (2) | (159)
Recoveries | 874 | 2,524
Provision & Transfers | 8,412 | (2,119)
Ending Allowance | 119,207 | 89,581
Commercial loans | Multi-family |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 13,853 | 10,404
Charge-offs | 0 | 0
Recoveries | 0 | 498
Provision & Transfers | 510 | (396)
Ending Allowance | 14,363 | 10,506
Commercial loans | Commercial real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 22,516 | 13,024
Charge-offs | 0 | (98)
Recoveries | 789 | 368
Provision & Transfers | 191 | (227)
Ending Allowance | 23,496 | 13,067
Commercial loans | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 38,665 | 32,235
Charge-offs | (2) | (50)
Recoveries | 50 | 144
Provision & Transfers | 5,604 | 1,347
Ending Allowance | 44,317 | 33,676
Commercial loans | Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 24,156 | 22,768
Charge-offs | 0 | 0
Recoveries | 0 | 54
Provision & Transfers | 2,209 | (903)
Ending Allowance | 26,365 | 21,919
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 10,733 | 10,904
Charge-offs | 0 | (11)
Recoveries | 35 | 1,460
Provision & Transfers | (102) | (1,940)
Ending Allowance | 10,666 | 10,413
Consumer loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 57,032 | 59,949
Charge-offs | (150) | (459)
Recoveries | 1,012 | 673
Provision & Transfers | (6,912) | (2,231)
Ending Allowance | 50,982 | 57,932
Consumer loans | Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 3,555 | 2,880
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | 39 | 50
Ending Allowance | 3,594 | 2,930
Consumer loans | Single-family residential |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 45,186 | 47,771
Charge-offs | 0 | (15)
Recoveries | 779 | 261
Provision & Transfers | (7,352) | (1,661)
Ending Allowance | 38,613 | 46,356
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 2,729 | 2,635
Charge-offs | 0 | (70)
Recoveries | 7 | 10
Provision & Transfers | 222 | (8)
Ending Allowance | 2,958 | 2,567
Consumer loans | HELOC |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 2,571 | 2,048
Charge-offs | 0 | 0
Recoveries | 0 | 93
Provision & Transfers | (209) | (107)
Ending Allowance | 2,362 | 2,034
Consumer loans | Consumer |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 2,991 | 4,615
Charge-offs | (150) | (374)
Recoveries | 226 | 309
Provision & Transfers | 388 | (505)
Ending Allowance | $ 3,455 | $ 4,045

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